Finding the Fourth Proportional to 3,857.55, 5,326.74 and 3,660.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,857.55 : 5,326.74 = 3,660.72 : x
2. Step 2: Convert to fraction form
   3,857.55/5,326.74 = 3,660.72/x
3. Step 3: Cross multiply
   3,857.55x = 5,326.74 × 3,660.72
4. Step 4: Simplify right side
   3,857.55x = 19,499,703.65
5. Step 5: Solve for x
   x = 19,499,703.65/3,857.55
6. Step 6: Final answer
   x = 5,054.95